Steve's Autocross Project, Modifications, ideas, suggestions... |
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Steve's Autocross Project, Modifications, ideas, suggestions... |
sgetsiv |
May 15 2009, 08:10 PM
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#1
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Former 914 Owner :( Group: Members Posts: 159 Joined: 20-June 08 From: Portland, OR Member No.: 9,192 Region Association: Pacific Northwest |
I started modifying my car a few weeks ago for autocross. It's a 1973 1.7l car with a more or less stock 1975 2.0l engine, very clean. After the Portland PCA AX #1, I made a few postings and got some suggestions. Rather than continue to hijack that thread, I thought I would start my own.
So here's where we are at today: Tarrett Engineering front sway bar installed and set to mid point 225# Rear Springs and perches Koni Sport Adjustable Shocks set 1/2 turn from full stiffness Turbo Tie Rods 205/50-15 Kuhmo Ecsta XS Tires Empi 44mm Dual Carbs (replaced a single Weber) Mallory Unilite Mechanical Advance Distributor JWest RennShift side-shift Triad Headers and Exhaust System - heat disconnected of course Porterfield R4-S Brake Pads - to be installed next week I think that's about it. Damn, she drives nice. Super tight in the corners. Wow. So, what's next? Besides just drive and compete. I know that. I don't plan to miss a single autocross opportunity in the Portland area. Pictures next. Don't complain yet. Would love to get more ideas and suggestions. Thank you, Steve |
914forme |
May 21 2009, 09:44 AM
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#2
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Times a wastin', get wrenchin'! Group: Members Posts: 3,896 Joined: 24-July 04 From: Dayton, Ohio Member No.: 2,388 Region Association: None |
Now for the analytical respounce.
The stock US spec 2.0L is ~90 HP, my class I have to run 2175 lbs, wet, no driver. Thats a power to weight ratio of 24.16 to 1 2056-125 is 17.4 2270-175 is 12.4 2316-185 is 11.7 2316-210 is 10.357 These cost from $4K-6K If I shave it down t fighting weight, not Pauls feather weights, but a reasonable racer weight. 1750 lbs. This is if your rules allow. 2.0-90 19.4 to 1 2056-125 is 14 2270-175 is 10 2316-185 is 9.4 2316-210 is 8.3 Now you get more bennifits if your car weighs less. Responsiveness, cornering, acceleration, braking, tire wear. Unfortunately you also have to put it into persecutive and figure, a new Vette, the bane of my existence, has a PTW of 7.9 to 1. It also cost ~4.5 times more of an entry price. Luckily auto-x is not about HP, though it helps, you don't necessarily need it to be successful. |
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